Ever Heard of a virus called Cabir or Caribe?? In November 2004 certain websites provided transfer tools for mobile ringtones, pictures and videos for series 60 phones. Many users downloaded these softwares not knowing that the phones were getting affected by virus which was rather deadly, named Cabir, a worm. This when installed tries to send its own components to any bluetooth device in range. This Virus forces the battery life to shorten because the Bluetooth Cannot be switched off.
To prevent Cabir virus, keep Bluetooth profile 'Hidden', in case the cabir message file is received (caribe.sis), try aborting the installation, if the virus has entered the phone, install the following software in the phone www.f-secure.com/tools/f-cabir.sis which will then search and destroy the virus components.